I just used tobetter's tree at the beginning to learn what components are needed for the M1. But then very quickly I started to get the patches directly from the mailing lists (patchwork) to have the last improvements. I just made preparations to build my 6.1.0-rc1 kernel package with these out-of-tree patches next week:
If I'm not completely wrong, Armbinan also applies these patches in one way or another. But they are not M1 specific either. Now add this set and that's it. I didn't check it, but with "linux-0001-rockchip-from-6.1.patch" it should also work with 6.0.0 sources. There's a lot of unnecessary stuff in it, but with 6.1.0-rc1, the set is no longer necessary anyway.
When it comes to the .config, it becomes difficult, my kernel package is built as a generic kernel, i.e. one build for all supported devices of the same architecture. I'm happy to provide my .config, but it fluctuates a lot and is therefore a snapshot. For the M1 support I only changed four config options from "m" to "y" to get my personal preferences and additionally built the module for the SPI controller. Everything else is like I use it for all my other devices.
Board DTS is in flight.
With ATF and DT rebase mainline firmware gets closer.
